Swarming or spreading in wave form is seen with motile organisms particularly Proteus mirabilis. Cause of swarming – The flagella of bacteria are naturally set to spin counter-clockwise ...

Pseudomonas aeruginosa, an increasingly prevalent opportunistic human pathogen, is the most common Gram-negative bacterium found in nosocomial, or hospital-acquired infections. This ...

  Haemophilus spp does not grow on 5% Sheep Blood Agar, which contains hemin (factor X) but lacks NAD (factor V). Haemophilus influenzae will grow in the hemolytic zone of ...

Colonies of Staphylococcus aureus on blood agar surrounded by wide zones of beta-hemolysis.

  Different types of bacterial hemolysis on blood agar : Staphylococcus – Hemolysis. A=Beta Hemolysis B=Alpha Hemolysis C=Gamma Hemolysis        

Klebsiella pneumoniae is a Gram-negative, non-motile, encapsulated, lactose fermenting, facultative anaerobic, rod shaped bacterium found in the normal flora of the mouth, skin, and ...

Streptococcus pneumoniae colonies have a flattened and depressed center after 24-48 hours of growth on Blood Agar, whereas the viridans streptococci retain a raised center